#include <stdio.h>
#define __DEBUG__ 1

int main()
{
    int i = 0;
    int arr[10] = {0};
    for(i = 0; i < 10; i++)
    {
        arr[i] = i;
        #if __DEBUG__
        printf("%d\n", arr[i]);//定义了__DEBUG__才编译
        #endif
    }
    return 0;
}